1 files changed, 61 insertions, 0 deletions
diff --git a/dx/src/com/android/dx/ssa/RegisterMapper.java b/dx/src/com/android/dx/ssa/RegisterMapper.java
new file mode 100644
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--- /dev/null
+++ b/dx/src/com/android/dx/ssa/RegisterMapper.java
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+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.dx.ssa;
+
+import com.android.dx.rop.code.RegisterSpec;
+import com.android.dx.rop.code.RegisterSpecList;
+import com.android.dx.util.ToHuman;
+
+/**
+ * Represents a mapping between two register numbering schemes.
+ * Subclasses of this may be mutable, and as such the mapping provided
+ * is only valid for the lifetime of the method call in which
+ * instances of this class are passed.
+ */
+public abstract class RegisterMapper {
+    /**
+     * Gets the count of registers (really, the total register width, since
+     * category width is counted) in the new namespace.
+     * @return >= 0 width of new namespace.
+     */
+    public abstract int getNewRegisterCount();
+
+    /**
+     * @param registerSpec old register
+     * @return register in new space
+     */
+    public abstract RegisterSpec map(RegisterSpec registerSpec);
+
+    /**
+     *
+     * @param sources old register list
+     * @return new mapped register list, or old if nothing has changed.
+     */
+    public final RegisterSpecList map(RegisterSpecList sources) {
+        int sz = sources.size();
+        RegisterSpecList newSources = new RegisterSpecList(sz);
+
+        for (int i = 0; i < sz; i++) {
+            newSources.set(i, map(sources.get(i)));
+        }
+
+        newSources.setImmutable();
+
+        // Return the old sources if nothing has changed.
+        return newSources.equals(sources) ? sources : newSources;
+    }
+}